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char HexString[3];, you need space for the null terminator at the end of the string. And depending on the source of the data input it may make sense to either use snprintf or verify that the value is never outside the expected range. It pays to always be paranoid about buffer overflows.0x05,HexString[0]='0',HexString[1]='5',HexString[2]=0.mySerial.println("GR+" + HexString);and I get an error regarding char and string cannot be added together.